"""Import 子域 Router。

外部系统限界上下文的导入/导出 API，覆盖以下能力：

系统级导入（两阶段流程）：
1. ``POST /preview``：根据适配器类型与源资产生成系统级导入草稿（系统 + 工具）
2. ``POST /confirm``：基于草稿执行实际持久化

工具级导入（两阶段流程）：
3. ``POST /tools/preview``：根据适配器类型与源资产生成工具草稿列表（不落库）
4. ``POST /tools/confirm``：基于草稿执行工具持久化

工具导出：
5. ``GET /tools/export``：导出单个工具配置
6. ``POST /tools/bulk-export``：批量导出工具配置

工具包导入/导出：
7. ``POST /tool-package/export``：导出工具包（含工具 + 系统 + 环境 + 资产）
8. ``POST /tool-package/preview``：工具包导入预览（检查冲突，不落库）
9. ``POST /tool-package/confirm``：工具包导入确认（导入系统/环境/资产/工具）

所有端点通过 ``create_use_cases_from_db`` 装配 use_cases，经 ``import_service``
端口调用用例。Request Schema 与 Input DTO 不共享类，Router 内显式构造 DTO，
操作人字段（``created_by``）由 ``current_user.uid`` 填充，角色字段
（``requester_role``）由 ``current_user.role`` 填充。
"""

from __future__ import annotations

from typing import Any

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel, ConfigDict, Field
from sqlalchemy.ext.asyncio import AsyncSession
from yuxi.external_systems.infrastructure.container import create_use_cases_from_db
from yuxi.external_systems.use_cases.dto.environment import EnvironmentOutput
from yuxi.external_systems.use_cases.dto.import_draft import (
    BulkExportToolsInput,
    ExportToolInput,
    ImportConfirmInput,
    ImportPreviewInput,
    ToolImportConfirmInput,
    ToolImportPreviewInput,
    ToolPackageAssetInput,
    ToolPackageExportInput,
    ToolPackageImportInput,
    ToolPackageImportPreviewInput,
    ToolPackageInput,
    ToolPackageItemInput,
)
from yuxi.external_systems.use_cases.dto.system import (
    ExternalSystemCreateInput,
    SystemImportDraft,
    SystemOutput,
)
from yuxi.external_systems.use_cases.dto.tool import (
    ExternalToolCreateInput,
    ToolOutput,
)
from yuxi.storage.postgres.models_business import User

from server.utils.auth_middleware import get_admin_user, get_db

import_router = APIRouter(prefix="/imports", tags=["external-systems-import"])


# ---------------- Request Schemas ----------------


class ImportPreviewRequest(BaseModel):
    """导入预览请求体。字段对齐 ``ImportPreviewInput``。

    ``payload`` 类型为 ``Any``，透传给适配器 ``generate_from_asset``，
    不同适配器期望不同结构（dict/list/str），与 ``ToolImportPreviewRequest``
    及 DTO ``ImportPreviewInput`` 保持一致。
    """

    model_config = ConfigDict(frozen=True)

    adapter_type: str
    source_type: str
    payload: Any
    asset_id: int | None = None


class ExternalSystemDraftRequest(BaseModel):
    """系统级导入草稿中的系统请求体。字段对齐 ``ExternalSystemCreateInput``。"""

    model_config = ConfigDict(frozen=True)

    slug: str = Field(..., min_length=1, max_length=128, pattern=r"^[a-zA-Z_][a-zA-Z0-9_-]{0,127}$")
    name: str = Field(..., min_length=1, max_length=128)
    description: str = Field(..., min_length=1)
    category: str = Field(default="default", max_length=64)
    adapter_type: str = Field(default="http", max_length=32)
    source_type: str | None = Field(default=None, max_length=64)
    enabled: bool = Field(default=True)
    connection_config: dict[str, Any] = Field(default_factory=dict)
    auth_type: str = Field(default="none", max_length=32)
    auth_config: dict[str, Any] | None = Field(default=None)
    secret_refs: dict[str, Any] = Field(default_factory=dict)


class ExternalToolDraftRequest(BaseModel):
    """系统级导入草稿中的工具请求体。字段对齐 ``ExternalToolCreateInput``。"""

    model_config = ConfigDict(frozen=True)

    slug: str = Field(..., min_length=1, max_length=128, pattern=r"^[a-zA-Z_][a-zA-Z0-9_-]{0,127}$")
    name: str = Field(..., min_length=1, max_length=128)
    description: str = Field(..., min_length=1)
    category: str = Field(default="default", max_length=64)
    adapter_type: str = Field(default="http", max_length=32)
    enabled: bool = Field(default=True)
    timeout: int = Field(default=30, ge=1, le=300)
    retry_policy: dict[str, Any] = Field(default_factory=dict)
    auth_type: str = Field(default="none", max_length=32)
    auth_config: dict[str, Any] = Field(default_factory=dict)
    adapter_config: dict[str, Any] = Field(default_factory=dict)


class SystemImportDraftRequest(BaseModel):
    """系统导入草稿请求体。字段对齐 ``SystemImportDraft``（system + tools）。"""

    model_config = ConfigDict(frozen=True)

    system: ExternalSystemDraftRequest
    tools: list[ExternalToolDraftRequest] = Field(default_factory=list)


class ImportConfirmRequest(BaseModel):
    """导入确认请求体。``draft`` 对齐 ``SystemImportDraft`` 结构（system + tools）。

    ``created_by`` 由 Router 用 ``current_user.uid`` 填充，不暴露给客户端。
    """

    model_config = ConfigDict(frozen=True)

    draft: SystemImportDraftRequest


# ---------------- 工具级导入 Request Schemas ----------------


class ToolImportPreviewRequest(BaseModel):
    """工具级导入预览请求体。字段对齐 ``ToolImportPreviewInput``。"""

    model_config = ConfigDict(frozen=True)

    adapter_type: str
    source_type: str
    payload: Any


class ToolImportConfirmRequest(BaseModel):
    """工具级导入确认请求体。字段对齐 ``ToolImportConfirmInput``。

    ``created_by`` 由 Router 用 ``current_user.uid`` 填充，不暴露给客户端。
    """

    model_config = ConfigDict(frozen=True)

    adapter_type: str = ""
    source_type: str = ""
    payload: Any = None
    drafts: list[dict[str, Any]] = Field(default_factory=list)
    selected_slugs: list[str] = Field(default_factory=list)
    override_existing: bool = False


# ---------------- 工具导出 Request Schemas ----------------


class BulkExportToolsRequest(BaseModel):
    """批量工具导出请求体。字段对齐 ``BulkExportToolsInput``。

    ``requester_role`` 由 Router 用 ``current_user.role`` 填充，不暴露给客户端。
    """

    model_config = ConfigDict(frozen=True)

    slugs: list[str] = Field(..., min_length=1)
    include_secrets: bool = False


# ---------------- 工具包 Request Schemas ----------------


class ToolPackageAssetRequest(BaseModel):
    """工具包资产请求体。字段对齐 ``ToolPackageAssetInput``。"""

    model_config = ConfigDict(frozen=True)

    id: int | None = None
    adapter_type: str
    asset_type: str
    name: str
    content_b64: str = ""
    size: int = 0
    checksum: str | None = None


class ToolPackageItemRequest(BaseModel):
    """工具包条目请求体。字段对齐 ``ToolPackageItemInput``。

    ``tool``/``system``/``environments`` 使用 ``dict[str, Any]`` 而非显式 Schema：
    其结构对齐 Output DTO（``ToolOutput``/``SystemOutput``/``EnvironmentOutput``），
    字段多且包含元数据（id 等），工具包导入为"导出-导入"闭环，前端回传的就是
    导出端返回的 dict。定义 Request Schema 副本会造成大量字段重复且无业务价值，
    结构校验由 ``_build_tool_package`` 中的 ``ToolOutput(**item.tool)`` 等
    Pydantic 构造完成。``assets`` 使用显式 Schema 是因为 ``ToolPackageAssetInput``
    是专为导入定义的 Input DTO（含 ``content_b64``），字段少且独立。
    """

    model_config = ConfigDict(frozen=True)

    tool: dict[str, Any]
    system: dict[str, Any] | None = None
    environments: list[dict[str, Any]] = Field(default_factory=list)
    assets: list[ToolPackageAssetRequest] = Field(default_factory=list)


class ToolPackageRequest(BaseModel):
    """工具包请求体。字段对齐 ``ToolPackageInput``。"""

    model_config = ConfigDict(frozen=True)

    items: list[ToolPackageItemRequest] = Field(default_factory=list)


class ToolPackageExportRequest(BaseModel):
    """工具包导出请求体。字段对齐 ``ToolPackageExportInput``。

    ``requester_role`` 由 Router 用 ``current_user.role`` 填充，不暴露给客户端。
    """

    model_config = ConfigDict(frozen=True)

    slugs: list[str] = Field(..., min_length=1)
    include_system: bool = True
    include_assets: bool = True
    include_secrets: bool = False


class ToolPackageImportPreviewRequest(BaseModel):
    """工具包导入预览请求体。字段对齐 ``ToolPackageImportPreviewInput``。"""

    model_config = ConfigDict(frozen=True)

    package: ToolPackageRequest


class ToolPackageImportConfirmRequest(BaseModel):
    """工具包导入确认请求体。字段对齐 ``ToolPackageImportInput``。

    ``created_by`` 由 Router 用 ``current_user.uid`` 填充，不暴露给客户端。
    """

    model_config = ConfigDict(frozen=True)

    package: ToolPackageRequest
    override_existing: bool = False
    target_system_slug: str | None = None


# ---------------- Endpoints ----------------


def _build_tool_package(package: ToolPackageRequest) -> ToolPackageInput:
    """将 Request Schema ``ToolPackageRequest`` 转换为 Input DTO ``ToolPackageInput``。

    显式构造嵌套 DTO（``ToolPackageItemInput`` / ``ToolOutput`` / ``SystemOutput`` /
    ``EnvironmentOutput`` / ``ToolPackageAssetInput``），保持 Router 层 Schema ↔ DTO
    不共享类的边界。
    """
    return ToolPackageInput(
        items=[
            ToolPackageItemInput(
                tool=ToolOutput(**item.tool),
                system=SystemOutput(**item.system) if item.system else None,
                environments=[EnvironmentOutput(**env) for env in item.environments],
                assets=[
                    ToolPackageAssetInput(
                        id=asset.id,
                        adapter_type=asset.adapter_type,
                        asset_type=asset.asset_type,
                        name=asset.name,
                        content_b64=asset.content_b64,
                        size=asset.size,
                        checksum=asset.checksum,
                    )
                    for asset in item.assets
                ],
            )
            for item in package.items
        ]
    )


@import_router.post("/preview", response_model=dict)
async def preview_import(
    payload: ImportPreviewRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """生成系统级导入草稿（系统 + 工具），不执行持久化。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ImportPreviewInput(
        adapter_type=payload.adapter_type,
        source_type=payload.source_type,
        payload=payload.payload,
        asset_id=payload.asset_id,
    )
    output = await use_cases.import_service.preview_import(input_dto)
    return {"success": True, "data": output.model_dump()}


@import_router.post("/confirm", response_model=dict)
async def confirm_import(
    payload: ImportConfirmRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """基于草稿执行系统级导入持久化。``created_by`` 取自当前管理员。"""
    use_cases = create_use_cases_from_db(db)
    draft = SystemImportDraft(
        system=ExternalSystemCreateInput(**payload.draft.system.model_dump()),
        tools=[ExternalToolCreateInput(**tool.model_dump()) for tool in payload.draft.tools],
    )
    input_dto = ImportConfirmInput(draft=draft, created_by=current_user.uid)
    output = await use_cases.import_service.confirm_import(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 工具级导入端点 ----------------


@import_router.post("/tools/preview", response_model=dict)
async def preview_tool_import(
    payload: ToolImportPreviewRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """工具级导入预览：根据适配器类型与源资产生成工具草稿列表（不落库）。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ToolImportPreviewInput(
        adapter_type=payload.adapter_type,
        source_type=payload.source_type,
        payload=payload.payload,
    )
    output = await use_cases.import_service.preview_tool_import(input_dto)
    return {"success": True, "data": output.model_dump()}


@import_router.post("/tools/confirm", response_model=dict)
async def confirm_tool_import(
    payload: ToolImportConfirmRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """工具级导入确认：基于草稿执行工具持久化。``created_by`` 取自当前管理员。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ToolImportConfirmInput(
        adapter_type=payload.adapter_type,
        source_type=payload.source_type,
        payload=payload.payload,
        drafts=payload.drafts,
        selected_slugs=payload.selected_slugs,
        override_existing=payload.override_existing,
        created_by=current_user.uid,
    )
    output = await use_cases.import_service.confirm_tool_import(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 工具导出端点 ----------------


@import_router.get("/tools/export", response_model=dict)
async def export_tool(
    slug: str = Query(..., min_length=1, max_length=128),
    include_secrets: bool = Query(False),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """导出单个工具配置。``requester_role`` 取自当前用户角色。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ExportToolInput(
        slug=slug,
        include_secrets=include_secrets,
        requester_role=current_user.role,
    )
    output = await use_cases.import_service.export_tool(input_dto)
    return {"success": True, "data": output.model_dump()}


@import_router.post("/tools/bulk-export", response_model=dict)
async def bulk_export_tools(
    payload: BulkExportToolsRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量导出工具配置。``requester_role`` 取自当前用户角色。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = BulkExportToolsInput(
        slugs=payload.slugs,
        include_secrets=payload.include_secrets,
        requester_role=current_user.role,
    )
    output = await use_cases.import_service.bulk_export_tools(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 工具包导入导出端点 ----------------


@import_router.post("/tool-package/export", response_model=dict)
async def export_tool_package(
    payload: ToolPackageExportRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """导出工具包（含工具 + 系统 + 环境 + 资产）。``requester_role`` 取自当前用户角色。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ToolPackageExportInput(
        slugs=payload.slugs,
        include_system=payload.include_system,
        include_assets=payload.include_assets,
        include_secrets=payload.include_secrets,
        requester_role=current_user.role,
    )
    output = await use_cases.import_service.export_tool_package(input_dto)
    return {"success": True, "data": output.model_dump()}


@import_router.post("/tool-package/preview", response_model=dict)
async def preview_tool_package_import(
    payload: ToolPackageImportPreviewRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """工具包导入预览：检查包中每个 tool/system/asset 是否与已有记录冲突（不落库）。"""
    use_cases = create_use_cases_from_db(db)
    package = _build_tool_package(payload.package)
    input_dto = ToolPackageImportPreviewInput(package=package)
    output = await use_cases.import_service.preview_tool_package_import(input_dto)
    return {"success": True, "data": output.model_dump()}


@import_router.post("/tool-package/confirm", response_model=dict)
async def confirm_tool_package_import(
    payload: ToolPackageImportConfirmRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """工具包导入确认：导入系统、环境、资产、工具，并重映射资产 ID。``created_by`` 取自当前管理员。"""
    use_cases = create_use_cases_from_db(db)
    package = _build_tool_package(payload.package)
    input_dto = ToolPackageImportInput(
        package=package,
        override_existing=payload.override_existing,
        target_system_slug=payload.target_system_slug,
        created_by=current_user.uid,
    )
    output = await use_cases.import_service.confirm_tool_package_import(input_dto)
    return {"success": True, "data": output.model_dump()}